Ultrasonic probing of the banana photon distribution in turbid media

Aner Lev; Zvi Kotler; Bruno Sfez

doi:10.1117/12.429317

15 June 2001 Ultrasonic probing of the banana photon distribution in turbid media

Aner Lev, Zvi Kotler, Bruno Sfez

Proceedings Volume 4256, Biomedical Optoacoustics II; (2001) https://doi.org/10.1117/12.429317
Event: BiOS 2001 The International Symposium on Biomedical Optics, 2001, San Jose, CA, United States

Abstract

Probing photon density in diffusive media is very important in order to model and understand their propagation. It is possible to detect photons outside the medium, but their non-invasive detection inside it is still an unsolved problem. An elegant, semi-invasive approach to perform this task is to scan a small absorbing sphere inside the turbid medium and measure the light outside the sample when the sphere is present and when it is not. However this method requires the medium to be liquid and such a procedure cannot be performed in the case of biological tissues. Ultrasound tagging of light has been introduced initially for transillumination imaging in turbid media, and then extended to the case of reflection imaging. Here we present results showing that it is possible to map the photon density inside solid turbid media by locally tagging photons using an ultrasonic field. We experimentally retrieve the well-known banana-shaped photons distribution when the source and the detectors are in a back-scattering configuration, using a gel-based homogeneous phantom. We also present experiments where hemoglobin has been introduced inside the gel. By fitting the experimental results with the theoretical formula, we are able to quantitatively retrieve the amount of hemoglobin introduced inside the gel, not only from data obtained by scanning the ultrasound waist inside the phantom, the in put and output fibers staying fixed.

Citation Download Citation

Aner Lev, Zvi Kotler, and Bruno Sfez "Ultrasonic probing of the banana photon distribution in turbid media", Proc. SPIE 4256, Biomedical Optoacoustics II, (15 June 2001); https://doi.org/10.1117/12.429317

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